"This person has punched me. I'm alive. Clearly he intended to kill me but hadn't hit a critical point where I would die. I'm lucky. I should now eliminate the threat"
instead a sane person would think the more logical
"This person has punched me. He said he wanted a fight prior. Clearly he has initiated a school fist fight."
School fist fight =/= (lol sorry for late edit) Intent to murder.